Water pump seal surface grinding pilot



April 1, 1947. s. THOMPSON 2,418,206

WATER PUMP SEAL SURFACE GRINDING PILOT Filed Oct. 12, 1945 FIG-'2 FIG. 3

5 E FIG. 4

7 V INVENTOR G5 STANLEY R. THOMPSON,

ATTORNEYS Patented Apr. 1, 1947 WATER PUMP SEAL SURFACE GRINDING PILOT Stanley R. Thompson, Washington, Iowa Application October 12, 1945, Serial No. 622,006

2 Claims. 1

This invention relates to pilots for centering and aligning equipment for grinding water pump seal surfaces, and more particularly to such pilots requiring no adjustment.

In repairing and rebuilding automotive water pumps, it is absolutely essential that the water pump seal surface be refaced smooth and in true axial alignment with the bore of the pump, or otherwise the seal will leak. This operation has always been performed manually in a slow and tedious manner.

An object of this invention is to speed up this operation by using a high speed power grinding equipment for smoothing the water pump seal surface and by aligning said grinding equipment by a pilot of simple construction.

A further object of this invention is to provide pilots for insertion in automotive pump bodies for aligning guiding equipment for grinding smooth the water pump seal surfaces, and pilots being rigid and of such dimensions as to fit the bores of various sizes of pump.

It is a further object of this invention to provide a pilot device insertible in the bearing or bushing bore of a water pump for centering grinding equipment for smoothing the seal surface seat wherein different adapters may be used with the pilot to fit various sized bores.

Other objects of this invention will appear from the following specification and claims and from the accompanying drawings illustrating the invention, wherein:

Figure l is an elevational view partly in secticn showing the pilot in position and the grinding equipment operating on the water pump seal surface seat;

Figure 2 is a plan View of the pilot per se;

Figure 3 is an elevational view of the pilot shown in Figure 2;

Figure 4 is an elevational view of an adapter for making the pilot fit a larger bored pump; and

Figure 5 is a plan view of the adapter shown in Figure 4.

Referring to the drawing, the water pump, designated generally by the numeral I, is a conventional water pump for automobiles, trucks, tractors, industrial motors, and the like. The water pump is shown in section in Figure 1 and is provided with a bearing or bushing bore 2 and a seal surface seat 3. The pilot 4, as shown in Figures 2 and 3, comprises a body portion 5 and a stem portion 6 and is made of a single piece of solid steel or other suitable material. The body portion 5 is inserted in the bore 2 of the pump I,

the stem portion 6 protruding upwardly and 00- inciding with the center line of the bore 2 and the seal surface 3. In Figure 1, the bore 2 is indicated as being of larger diameter than the body portion 5. In this case, a cylindrical adapter '1, shown in Figures 4 and 5, may be slipped over the body portion 5 so that the pilot will be held rigidly in position. The adapter I has an inturned portion 8 for limiting movement of the adapter 7 relative to the body portion 5.

Figure 1 shows a conventional high speed power grinding equipment 9 having a rotary grinding tool or head in bearing on the water pump seal seat 3 for smoothing said seat. To make sure that the seat is smoothed true, the pilot stem 6, which coincides with the center line of the bore 2 and the seat 3, extends into the drive sleeve ll of the grinding equipment to maintain sleeve H in proper alignment and insure a true, smooth surface being fashioned on seat 3.

It is evident that a simple, and yet effective, pilot has been provided to insure the grinding equipment 9, l0 and II being set properly. It is to be noted that no adjustment or expansion of the pilot body is required other than the use of an adapter to enable the use of a small pilot on a large water pump.

This invention may be practiced by the use of a single pilot of specific dimensions to be used with a series of adapters for the body and stem portions to fit the bores of the various pumps and sleeves of different grinding equipment. If desired, a number of separate and distinct pilots of different dimensions may be used for the body portion and stem portion, each for its particular size of water pump and grinding equipment. Considering the automotive water pump now in use, three different sizes of pilots will fit per cent of all the water pumps.

While a, certain specific embodiment of this invention has been shown, it will be understood that various modifications may be made within the spirit of the invention. Therefore,- no limitations on the invention are intended other than are imposed by the scope of the appended claims.

I claim:

1. A pilot member for centering and aligning a water pump seal seat grinder comprising a cylindrical body member, a stem portion extending axially from said body member, and a cylindrical sleeve fitting over said body member, said sleeve being formed with an inturned member limiting separation of said sleeve from said body member, said sleeve being adapted to fit into the bore of the water pump, whereby said stem por- 3 tion will be located axially with respect to said bore and in a position adapted to guide said seat grinder.

2. A pilot member for centering and aligning a water pump seal seat grinder comprising a cylindrical body member, an axial stem integrally formed with said body member, a cylindrical sleeve fitting over said body member, and an inturned annular flange formed on the end of said sleeve adapted to bear on the body member adjacent said stem, thereby limiting separation of said sleeve from said body member, said sleeve being adapted to fit into the bore of the water pump, whereby said stem will be located axially with respect to said bore and in a position adapted 15 REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 7 Number Name Date 1,626,212 Roy Apr. 26, 1927 1,636,560 Hall July 19, 1927 1,775,898 Fleming Sept. 16, 1930 2,125,442 Healy Aug. 2, 1938 2,194,062 Albertson et a1. Mar. 19, 1940 V 2,338,484 Beverlin Jan. 4, 1944 

